I once helped someone get their car home after one of these was installed. Their license would not be returned until it was installed, but they weren't allowed to leave it on the lot. Someone else drove it there, and then I got to experience the breathalyzer to drive it home.

The interesting part is how bad the interlock was. First off, it can apparently randomly not work, so you get three tries. Worse yet, per the official documentation, apparently they can misdetect an ignition while driving at speed, and when that happens you have to pull over and blow within thirty seconds. Now, this is not something you can do while driving, as you have to look at the camera while you do it, on top of needing to have a deep breath. There's no motivation to improve this, because the customer is the legal system, not the person who has to have it installed